Riveting mechanism



1.. c. HUCK RIVETING MECHANISM Filed March 6, 1936 Sheets-Sheet l I INVENTOR. 1 all: s C. Huck.

I f y 744.,

A TTORNEYS.

Oct. 4, 1938. c. HUCK RIVETING MECHANISM 4 Sheet-Sheet 2 Filed March 6, 1936 25. a 9 a w ATTORNEYS.

Patented (Pet.

PATET OFFICE RIVETING MECHANISM Louis C. Huck, Buchanan, Mich., assignor to Huxon Holding Corporation, a corporation of Michigan Application March 6,

14 Claims.

This invention relates to a rivet setting machine adapted to set the type of rivet disclosed in the applications of Louis C. Huck, Serial No. 627,343, filed August 3, 1932, now Patent No. 2,061,628 issued Nov. 24, 1936; Serial No. 681,362, filed July 20, 1933, now Patent No. 2,061,629 issued Nov. 24, 1936, and the particular form of the rivet disclosed in Serial No. 21,473, filed May 14, 1935.

An object of the invention is to provide a single anvil rivet gun forsettin'g the above type of rivet as distinguished from the double anvil guns shown in the application of Louis C. Huck et al., Serial No. 636,480, filed October 6, 1932, now Patent No. 2,053,719 issued September 8, 1936, and the applications of Louis C. Huck, Serial No. 21,472, filed May 14, 1935, and Serial No. 21,474, filed May 14, 1935, now PatentNo. 2,088,859 issued August 3, 1937, and to provide a single anvil gun which is adapted to set a rivet in the manner set forth in the application of Louis C. Huck, Serial No. 21,473, filed May 14, 1935.

One object of the invention is to provide an improved anvil construction for a single anvil gun of the type disclosed in the aforesaid application, Serial No. 21,473.

Another object is to provide means in conjunction with a single anvil rivet gun to ejectthe rivet head from the anvil.

Another object of the invention is to provide a greatly simplified and more powerful single anvil rivet gun of the type mentioned.

Another object is to provide ascavenging means whereby any air or other foreign matter in the operating fluid will be removed from the gun during the normal operation thereof.

Another object is to provide an improved trigger and handle construction adapted to be readily operated in any position of the gun.

Another object is to generally improve the details of construction in order to provide a gun which is relatively inexpensive, rugged and easy to assemble.

Other objects and advantages of the invention will become apparent from the accompanying drawings, specification and the appended claims.

In the drawings wherein like numerals are applied to like parts in the several views:

Figure 1 is a longitudinal vertical section of the gun showing its internal construction.

Figure 2 is a plan view of the gun, partly broken away.

Figure 3 is an end view of the the gun.

Figures 4, 5, 6, 7, 8 and 9 are transverse secoperating end of 1936, Serial No. 67,458

tional views taken on the line ll, 5-5, 6-6, '|-I, 88 and 9-9 of Figure 1, respectively.

Figure 10 is a longitudinal section taken on the line l0l0 of Figure 3.

Figure 11 is a horizontal section looking up- 5 wardly and taken on the line ll-H of Figure 1.

Figure 12 is a side elevation of the sleeve which carries the pin gripping element showing in elevation the structure illustrated in section in Figure 4, with a portion of the outer casing broken away.

Figures 13, 14 and 15 are enlarged sectional 11, the upper part of the casing is provided with 2 a pair of smaller longitudinal bores 12 and 13. As shown in the latter figure, the bore I3 is threaded at one end to receive a threaded coupling memher by means of which a pressure fluid conduit l4 may be connected in communication with the bore. The bore l2, at the corresponding end thereof, is likewise provided with a coupling member by means of which it is connected to a pressure fluid conduit l5. These pressure conduits are connected to a suitable source of pressure through a control valve which is operable in one position to supply fluid under pressure, to one conduit and at the same time to connect the other conduit to exhaust, and which is operable in another position to supply fluid under pressure to the latter conduit, and at the same time to connect the former conduit to exhaust.

Such pressure supply means and control valve is disclosed in detail in the copending application of Louis C. Huck, Serial No. 21,474, filed May 14, 1935. As shown diagrammatically in Fig. 19 of the present application,.this means comprises a fluid reservoir l, a pump 2, a control valve 3 having operating solenoids 4 and 5, and a pressure booster cylinder 6, connected by suitable conduits with each other and to the gun. The arrangement is such that, in one position of the control valve fluid is supplied from the pump through the control valve to conduit l5 while the conduit I4 is c nnected through the valve to the exhaust reservoir. When the valve is shifted from said position by the solenoid 5, the pump supplies fluid through the valve to the large cylinder 8 of the booster and the small cylinder 9 of the booster is placed in fluid communication with conduit l4. At this time conduit I5 is connected through the valve to the exhaust reservoir. It will be apparent that asthe solenoids are alternat vely operated first one of the conduits l4 and I5 will be connected to a source of fluid under pressure while the other is connected to exhaust and thenthe first will be connected to exhaust while the othe. is connected to a source of fluid under pressure. Moreover, the pressure supplied to the conduit I 4 will be augmented by the booster 6.

As shown best in Figure 1, the handle, indicated generally at l6, comprises an attaching portion I1 secured to the top of the casing by any suitable means, such as stud bolts l8, and a hollow hand engaging portion l3 connected integrally at each end to the corresponding end of the attaching portion I! by curved connecting portions 20 and 2i respectively. It will be noted that the hand engaging portion is symmetrically proportioned with respect to the axis of thegun and ,is parallel therewith. In addition, the handle is positioned above the center of gravity ofthe gun in order that the gun will remain in a level position when supported by the handle during horizontal riveting. Adjacent the opposite ends of the hand engaging portion the under side thereof is cut away at 22 and 23 to provide openings for the reception of trigger members 24 and 25, respectively. These trigger members are identical; although oppositely disposed, and each is connected to a leaf spring 26 adjacent the op-.

.2l respectively, and are held in fixed position -with respect to the handle by clips 3| which in turn are secured to. the handle by means of studs 32 and extend into slots in the ends of the leaf spring at 33. The leaf spring extends through the hollow portion'pf the handle and its intermediate portionis twisted 90 with respect to the vertical end portion, as at 34, to provide increased flexibility in a vertical plane and has an ofi'set U-shaped central portion 35 engaging a pin 36 carried by the handle portion I9.

For the purpose of limiting movement of the trigger elements upwardly and thereby preventing possible damage to the leaf spring and switch element 31 as well as other parts of the switch, a stop 40 is provided above each trigger. Thus, even if the operator presses very hard on the trigger, the flexing of the spring and actuation of the switch is efiected the same as if the trigger were moved easily against the stop. This arrangement is designed to promote durability of the switch actuating parts while at the same time to insure positive actuation of the switch.

It will be observed that by reason of the symmetrical proportioning and position of the handle that it may be grasped readily in any position of the gun. Moreover, since the trigger members are duplicated and are likewise symmetrical with respect to the main hand engaging portion, one of said trigger members will be in position to be grasped and operated by the index'finger of the hand regardless of the position I of the gun.

When it is desired to initiate the action of the gun, either one or the other of the trigger members may be pressed. This flexes the intermediate portion of the spring 26 upwardly into opera- The switch is designed to maintain the circuit closed through solenoid 4 so long as pressure is applied to one of the triggers, but will open that circuit and close the circuit to the opposite solenoid 5 when the pressure on the trigger is released. As the result of thisarrangement the conduit I5 will normally be connected to the source of pressure while the conduit I5 is connected to e aust. When the trigger is pressed, however, conduit 'l5 is connected to exhaust and the conduit 14 is connected to the high pressure cylinder 1 of the booster.

-The bore I3 is in constant'communication with the left hand end of the main operating cylinder through a port 4|, as, shown in Figures 1 and'l,

while the .bore 1 2 is in constant communication -with the right hand end of the main operating cylinder through port 42, as shown in Figures 1-.

and 8. Thus, when'fiuid pressure is applied to the bore I3, it will be eifective upon the left hand end of piston H, and will move. the piston to the right, as viewed in Figure 1, while, application of fluid pressure through the bore l2 will effect return movement of piston II to the left.

, Itwill be noted that by reason of the fluid pressure operating connections so far described,- reciprocation of piston I I in the main cylinder will be accompanied and caused by reciprocation of liquid columns in the bores and conduits respectively. Some liquid will be exhausted'from one conduit at that end'remote with respect to the gun during each stroke of the piston and likeof the other conduit. If the conduits are short, some liquid in the gun will be also exhausted and likewise fresh liquid will flow through the other conduit into the gun. On the other hand if the conduitsare long, the liquid in the gun normally would remain in the gun and conduits and only liquid columns in the exhaust and supply ends of the conduits, that is the ends remote. from the gun, would be exhausted and resupplied with fresh oil. Under any set of circumstances where the same liquid is apt to remain in the gun, it is desirable. to obtain a replacement of this liquid, or else any dirt and other foreign matter, and especially air, which might collect in the gun, would permanently be trapped. .To obtain this replacement of liquid in .the gun, a scavenging valve is provided that will causea progressive change of the liquid dur- -wise additional liquid will be supplied to the end ing repeated operation of the gun or a slow conopening 41,

that the enlarged portion opens to the left face of casing 10. Positioned within the enlarged portion of bore l2 and seated against shoulder 45 is an annular member 46 having a small axial bleed Atvalve cage'48 is seated against member 45 and a packing ring 49 is positioned between these members to prevent leakage along the wall of the bore. .The valve cage 48 is held against the packing 49 by means of an assembly comprising a flanged tubular member 50, which is seated against cage member 48, a packing ring 5| seated against member 50, a cap member 52 which is seated against the packing ring 5|, and

' a screw threaded plug 53 which is screwed into the open end of the enlarged portion of bore 12 and bears against the cap 52. The valve cage 48 has an axial bore for the reception of a sliding valve 54, and an axial port 55 of smaller diameter than said bore, and in communication therewith. The juncture between the bore for receiving valve 54 and port 55 forms a shoulder against which a reduced end portion of valve 54 is adapted to bear, and thus limits movement of the'valve to the right. The cage member 48 is provided with a lateral port 56 in communication with the interior of the cage, a circumferential recess 51 in its, outer periphery, and a longitudinal external groove 58 providing fluid communication between port 55 and recess 51. Recess 51 is so in fluid communication with the left hand end of the interior bore of cage member 48 through a radial slot 59 in the end of the cage member, and is also in communication with the left hand end of the main cylinder bore of casing l0 through a diagonal conduit or port 60, shown in Figure 10. Valve 54 is provided with a stem 5i, and a helical spring 62, positioned within a housing 1 formed by members 50 and 52, surrounds the stem ti and bears at its opposite ends on the valve 54 and the cap 52 respectively, thus urging the valve member to the right as viewed in Figures 10 and 11. I

When liquid pressure is applied through bore It to the left hand side of the operating piston ll, it acts by reason of port 60, recess 51, groove 58,

and slot 59, on the left hand end, of valve member 56. Since bore i2 is open to the exhaust tank at this time, the valve will be held in closed position and against the shoulder around port 55 and no fluid can flow from bore l3 into bore l2,

However, when the operating connections are reversed and liquid pressure is applied to bore l2 and exhaust to bore l3, the fluid in the low pressure bore I! will leak through the bleed opening filand build up sufflcient pressure at the right hand side of valve 54' to shift this valve to the left against the pressure of spring 62 thuszopening communication between port 55 and port .55 of the valve cage 48. When this occurs a limited 50 quantity of the fluid in bore It will flow through bleed opening 41, port 56, groove 58, recess 51, and

' port 55 to the left hand end of the operating piston ll. This limitedflow from the bore l2 into the left hand end of the main operating cylinder 65 is insufllcient to interfere with the normal return 7 into the left hand end of the main cylinder,-

where it can exhaust into the bore it through port 45. During succeeding operations of the gun this fluid with any entrapped air or foreign matter will progress back through the conduit i5 line to the storage reservoir or tank. In the event any air tends to remain in the cylinder, it tends to disperse in the liquid (oil) during movement .of the piston back and forth, and by replacing the oil, the air also is removed in this manner. During idle periods when the gun is not operated, but the pump is running, a constant scavenging action will take place as the liquid will constantly flow through the bore l2 and leak through the opening 41 and pass through the scavenging valve.

Piston II is forged integrally with a tubular piston rod having a section I0 to the left of the piston, as viewed in Figure 1, which is of smaller external diameter than the section II at the right hand side ofithe piston. Leakage past the piston rod section H is prevented by a packing gland comprising a gland nut 12 threaded into the casing l0 and bearing against suitable packing rings 13 which surround the piston rod and seat against an internal radial projection I4 adjacent the right hand end of the operating cylinder.

The gland nut has an annular series of castellations 15, as shown in Figure 9, into which a tool may be inserted to tighten the gland. Means for locking the gland nut in adjusted position are provided comprising a recess 15 adjacent the bottomportion ofthe casing ill into which is inserted a, locking member 11 having a projection adapted to extend into one of the notches I between the annular series of.castellations. The

locking member 11 is held in position by any suitable means, such as a cotter pin 18, as shown in Figure 9. r

A bearing or guide sleeve is provided exteriorly of the packing gland for guiding the piston rod section H. This bearing member is held in position against an abutment on the casing by means of an annular nut 8! which is threaded into the opening in the casing ill. The annular nut 8! has a tubular extension 82 upon which is carried a guard member 83 secured in position.

by any suitable means such as a split ring having ears 84 through which a tightening bolt 85 is inserted. At its outer end the guard 83 is curved downwardly and then reversely as indicated at 86 and 87 respectively and the purpose of this constructionwill presently be described.

The left hand end of the operating cylinder is closed by means of a cylinder headall seated against a shoulder on the casing and held in position thereagainst by means of an annular hexagonally headed nut 91 which is threaded into the casing. The nut 9| is. provided with a plurality of radially extending holes 91 adjacent its outer face, and a wire 98 is passed'through one of these holes and through a hole in the adjacent edge of the casing. The ends of the wire are twisted together as shown in Figures 2 and 3, to prevent accidental rotation of the nut. The cylinder head is provided with an elongated tubular extension 52 within one portion of which ismounted a packing gland comprising a gland nut 93 having an annular series of castellations 93' for the reception of a suitable tool for turning the nut, and having a portion hearing against a series of packing rings 94 which seat against an internal shoulder in the cylinder head opening. The tubular extension 92 of the cylinder head 95 is provided with a longitudinally gagement withthe recess between two adjacent 6 series of radial openings I03, and a spring retaincastellations on the gland nut to maintain it in adjusted position, as shown in Figure 6.

Outwardly of the gland nut 93, the tubular member 92 is provided with an internal shoulder against which is seated a bearing or guide sleeve I for the piston rod section I0. Bearing sleeve I00 is held in position against the internal shoulder on the tubular extension 92 by means of an annular nut IOI which is threaded into the tubular extension 92 and which is provided with an annular series of castellations I02, as shown in Figure 5. Member 92, adjacent the castellations in nut IN, is provided with an annular ing ring I04. is positioned within an internal groove in the series of annular castellations on nut IOI, and has a bent up exten'sion I extending into one of the radial openings I03 of the tubular extension 02.

A barrel I 06 is provided with an enlarged end section I01 which is telescoped over the end of tubular extension 92 and threaded thereto at I08. The thread bearing end of the barrel section I0'I is provided with a hexagonal exterior periphery as shown in Figure 5 for engagement with a wrench, and the internal shoulder adjacent the juncture of the smaller and larger sections of the barrel is seated against the end of tubular extension 92, at I09.

A pin gripping means is connected to the left hand end of the piston rod section I0. This means comprises a plurality of jaw members I I0 of the type disclosed in the aforementioned copending application, Serial No. 21,474. These jaw members, three in number, are loosely positioned within a jaw pulling sleeve- III, and the jaws and sleeve I I I have inclined co-acting faces whereby the application of a pulling force by said sleeve effects an inward radial movement of the jaw members. The sleeve III is threadedon a sleeve member H2, and a suitable locking means is provided for locking sleeve members-4H and H2 against relative rotation. v This locking means, as shown in elevation in Figure 12, comprises a ring II3 having oppositely offset portions H4 and H5 adapted to engage respectively in a notch H6 in sleeve III and in one of a plurality of notches II! in a shoulder on sleeve I I2. Four circumferentially spaced holes H8 are provided in sleeve III to be engaged by a tool for rotating the same when the-locking member H3 has been retrieved.

As shown inFlgures l, 4 and 12, sleeve H2 is threaded on the left hand end of the piston rod section 10, and is locked in position thereon by means of a pair of tapered pins I and I2I which are driven into suitable openings I22 and I23, respectively, in the enlarged end of sleeve II2. These openings at their midpoints intersect the opening within sleeve -I I2, and at the points of intersection the pins engage a ring I24 of soft metal which surrounds piston rod section I0 and bears on a series of axially extending serrations in the piston rod, not shown. It will be observed that when pins I 20 and I2I are driven into these openings, sleeve H2 and the associated sleeve II I. will be locked to the end of the piston engagement with jaws Il0. Avguide sleeve I32 As best shown in the enlarged Figure 13, the

left hand extremity of barrel I0 6 carries an annular anvil supporting block I35 which is threaded into the end of barrel I06 and bears tightly against an annular member I36, which in turn is seated against an internal shoulder I31 on the barrel I06. An annular anvil I38 is seated within the opening in block I35,'and is provided with an external shoulder adapted to seat against a corresponding shoulder in that opening, The opening within anvil I38 is provided with an annular conical outwardly flared mouth forming an inclined working surface I39 adapted to engage a corresponding surface on the head I40 of the tubuluar member I4I of the two part rivet. As set forth in the aforementioned application, Serial No. 21,473, this anvil is adapted when the reaction force increases beyond that required to form the head on the opposite end of the tubular member to advance over and swage head I40 onto the rivet pin I42.

8 An ejecting member I is slidably mountedwithin the cylindrical portion of the opening in anvil I38 and is adapted to surround the rivet pin I42. A shoulder. I5I on the ejecting member is adapted to engage a corresponding shoulder on the opening within anvil supporting members I35 as well as the inner face of the anvil itself and limit movement of the ejecting member to the left, as viewed in the drawings. An opposed shoulder I52 on the ejecting member is adapted to engage the annular member I36 and limit movement of the ejecting member to the right with respect to the anvil. The left end of the ejecting member is adapted to engage the end face of the rivet head I40 and this in conjunction with the shoulder I52 engageable with the member I36, provides an eflicient means for positively preventing further swaging movement of the anvil after sufiicient swaging is effected. It has been found that under certain conditions, the

anvil should engage the plate to effect the deis released, sleeve member III will advanceto' the left with respect to barrel I06, during which movement it will come into abutment with the surface 153 on the ejecting member I50. Since the latter will engage the rivet head, the fluid pressure in the casing I0 will act against the right end of the cylinder and move the casing, barrel I06 and anvil I38 away from the rivet head as shown by Fig. 15. Iii this way,'the anvil is freedfrom any grip it may have with the rivet head.

In Figure 16 is shown a sligh 1y modified form.

of the ejecting member and a vil mounting. In this figure the anvil I55 is mounteddirectly upon an end portion of sleeve member I06. The anvil is formed as before except that at its inner end it is provided with an internal radially extending shoulder I56. The ejecting member I 51 is provided with a pair of external axially spaced radially extending shoulders I58 and I50 adapted to engage with shoulder I56 to limit the movement of the ejecting member with respect to the anvil for the purposes set forth above in connec tion with the structure, shown in Figures 13 to 15.

It he noted that the inner flange or shoulder I89 on the ejecting member is made of a separate piece and the latter is either press flttedon the ejecting member or the end of the latter may be peened over to lock the piece in place. In this --modiflcation, as in the ejecting member a head of the tubular member. and it positions the shown by Fig. '13, the mouth of the opening in with a radially extending flange IOI having an" enlarged tubular axial extension I02 engaging barrel I06 and extending into an annular recess in, the end of sleeve member I II. The tubular extension I02-of the ejecting member is preferably fixed to sleeve III, but may loosely engage' the sleeve III, if desired.v Ineither case the ejecting sleeve will move rearwardly, or to the right as viewed in the drawings, with respect to the anvil during the rivet setting operation and cannot be relied upon to limit the swaging movement'of'the anvil with respect to the rivet head. Accordingly; in this modification the swaging anvii I63 is itself provided with a rhoulder I64 which is adapted to engage the end of the rivet and limit, the movement of the awning anvil over the head. During the return of the parts of the gun to normal position, sleeve I06, as previously described, moves to the left with respect to the sleeve III, thus moving the anvil I60 to the right with respect to the ejector I60, thereby forcing m the anvil away from the rivet head. In this modification the ejecting member need not'have any bearing on the anvil per se. It will be noted that the anvil and ejecting member may be readily assembled, or disassembled. Y -1 v In Figure 18 I have disclosed still another form 4 of ejecting member which is similar to that disis such that the ejecting member. or shoulder on closed'in Figure 16 except that it is formed of a pair of telescoping-sleeve members Ill and I12, having external flanges at their opposite ends. 50 vThe two sleeved members may be secured to-.

tact with the opening in the plates us and m. as shownin Figure 14. Substantial completion of the head ,forming pin movement places the circumferential grooves I48 .on the pin within the relatively deeflcircumferential groove I in the pin adjacent the end face .of the rivet head.

Thereafter the pulling forceTon the pinis increased and the resulting increased reaction force on the swaging anvil efleci's movement thereof over the head with a consequent inward radial movement of the metal in the head into the grooves I48 in the rivet pin. Asshown in Figure 14 the swaging movement or the anvil I88 with respect to the rivet head I40 is under way and is nearly completed. It will be understood that the spreader ring expands during the setting operation and prior to breakage of the pin, so that movement of the head on the pin into the tubular-member is highly resisted when theten'sion on 20 the pin is increased to tighten the rivet or to break the pin.

As stated previously, the arrangement of parts I40 ihto the anvil to permit this engagement is necessary.' It i to beunderstood therefore that -3 the ejecting member or shoulder on the anvil should permit the amount of movement of the rivet head I40 into the anvil that may be required to obtain a properly set and'swaged rivet assembly. After proper swaging is effected, movement of the anvil'wlll be resisted more highly, and tension on the pin will be increased until it breaks at the break neck I49.

The machine is operated in the fcllowing manner., An assembled two part rivet comprising a do tubularmember HI and a rivet pin its is inserted v into the opening in the plates and then the gun is brought into position with the head on the tubular member in abutment with the swaging'anvil I30 and the-grooves I54 in the end of the rivet pin in juxtaposition with the corresponding grooves IN-in the jaw members IIO. When the gun" is in proper position either one of the triggers at or 25 is pressed, whereupon the pressure supply valve will supply fluid to bore It in the casing ,gether by a pressed flt or by welding, but in either event this ejecting member functions in exactly the same manner during operation .of the gun as does that disclosed in Figure 16. l

The machine just described is adapted, for example, to set a rivetfsuch asjdisclosfilin theco-' pending application, Serial. No.- 21,473 mentioned I0 and connect b'ore I2 to exhaust. Under these conditions fluid will flow from bore IB- through above. As best shown in Figure 13, .the' rivet initially comprises a .tubular member I4I having an enlarged head I40 upon which is provided at one end'an'v annular conical peripheral surface Ill. The rivet pin I42 is provided with a a spreader ring I 44' and a head I40 adapted, when the pin is pulledthrough the tubular member and the tubular member is held against movement," to collapse the relatively thin wall I40 of the tubular member as shown in Figure 14 to iornr a head at that end of the tubular member. As the rivet pin is pulled through the tubular membenthe shoulder I4'I on the pin, between the enlarged portion adjacent the head or the pin and there-- mainder'of the .pin which is of slightly smaller 3 diameter, engages a corresponding shoulder on the internal wall of the tubular member and t5. spreads the tubular member into very slow con-' .-ment carries with it the. section I0 of the piston port 4| into the left hand end of the operating cylinder and will force piston II to the right with respec't'to the casing.- Piston I I in its move- 5 rod, sleeves II2 and III, and the gripping jaws "0. Movement, ofthe gripping jaw sleeve III to the right with respect to the rivet pin will force' the jaw members IIO into tight engagement with thepin grooves I54 and effect a pull on the pinto the right as viewedfln the drawings.

v At the same time the reaction to the pressure in the'left hand end of the operating cylinder g shoulder I41 on the pin has moved through head I40, the tubular member at its left end has completely collapsed to forma head at the end, and 70] very greatly increased with the result that the fluid pressure will automatically build up in the left hand end of the operating cylinderuntil sum- While there are disclosed several modifications of certain portions of themechanism, it is obvious that other modifications of the mechanism are available without departing from the spirit of the invention as illustrated and described-and as set forth in the appended claims. What is claimed is: I

cient pulling force on the pin and reaction force ,1. A' machine for setting the type of rivet on the rivet head through anvil I 38 has been wherein a pin is pulledpartially through a tubucreated to drive the anvil over the head and cause lar member having a preformed head at one end a flow of the metal in the head radially'inwardly to form a second head at the opposite end, in-

into' the grooves 8 of the rivet pin. Thenafter I completion, of the swaging action necessary, cylinder, a hollow tubular piston rod connected eration Just described. .4 1

which may or may not require engagement of the anvil with the plate, the pin will break under increased tension at the break neck I.

When the pinbreaks, gripping jaws H0 will tend to slide backwardly due to the inherent .resilience of the parts, but this movement of the gripping jaws will be materially retarded by the jaw follower I30 as well as by springs- Iii. The broken end'of the rivet pin will then or later during repeated'riveting pass on through the hollow piston rod and eventually will be ejectedthrough member 81. The guard 83 is provided to insure that the rivet pins, when ejected from member 81, will always travel in the same direction so that they can be avoided by the operator, and the direction is so selected that the broken pin ends cannot strike the fluid conduits.

As soon as the rivet pin is broken the operator.

to said piston and extending through both ends of said cylinder, means to engage the rivet pin 1 connected, to the piston rod and having an opening therein communicating withthe opening through said rod, '9. combined thrust member and swaging anvil fixedly secured to said cylinder, and means for supplying fluid-pressure to said cylinder to effect the head forming operation, swage the preformed head to the pin, and break the pin, said pin engaging member being adapted to discharge said broken pin end through said hollow piston rod.

2. In combination, a single anvil riv et gun having a. cylinder, an operating piston in said cylinder, means connected to said piston for exerting a pulling force on one rivet element, and a combined unitary thrust member and swaging anvil fixed to the cylinder and adapted to engage 'cluding, a closed ended cylinder, a piston in said v and transmit the reactive force to another ele- .ment of-the rive't, of a pair of flexible conduits connected to the cylinder and in constantly open communication with the opposite ends thereof respectively, fluid pressure means remote from said gun for alternately supplying an excess of fluid pressure to One or the othe of said conduitat-yitnd means on the gun for controlling said fluid pressure means.

3. In combination, a rivet 'gun including a pass through the scavenging valve 54 and into the double acting cylinder and operating piston, a operating cylinder at the left hand side of piston fluid conducting line.connected to and in concarrying with it any entrapped air or foreign stant communication with the space at one end matter. of the piston, 'a fluid conducting line connected During the movement of piston l I to the left,

piston rod section 10 and sleeves III and II I are likewise carried to the left, and the reaction force to and in. constant communication withthe space at the opposite end of the piston, means remote from the gun operable in one, position is applied to the casing through the right hand to supply high pressure fluid to the first line ahd end of the cylinder, thus forcing the casing and permitexhaust through the second line and operbarrel IN to the right with respect to the sleeve able in another position to supply low pressure III. This relative movement causes a thrust to fluid throughthelow pressure line and permit 7 exhaust through the flrstline, and means on the be transmitted from sleeve Ill through the l n m m er o the D of the rivet l 811d gunfor controlling said last named means. the reaction pulling force to this thrust is applied h h the barrel I08 and is effective to pull wherein aheaded pin is pulled partially through the anvil Ill oi! the rivet head. This is important in smu h s i Pr v D w means for oneend to formf'a second head atdts other end,

4. A machinefor setting rivets of the type va 'tubular memben having a preformed head atremoving the swaging anvil from the rivet head. jncludjng, meaiis t engage the in, anvil without. in any wayioosening the rivet Joint.

As soon as the swaging anvil is pulledfree of the rivet head the operator may apply the gun to a second rivet and repeat the cycle of op- It is apparent from the. above description and the accompanying drawings that the invention comprises a machine for setting rivets of the type described which is simple and effective for the purpose described; that it effects such rivet setting by means of -a single anvil; and math; provides a.powerejecting means for ejecting the rivet upon completion of the-head swaging' operation. Moreover, the parts are so designed that they may be easily manufactured and assembled or disassembled for repair.

- reverse the direction ofthe app adapted to exert a pulling force on one rivet element, an anvil adapted tovengage and swage another element of the rivet 'by telescoping over the same, and. means for applying a force in one direction on said first means and a reactive force on said anvil to cause they anvil to swage said other element to said first-named element, means to reverse the direction of said force to restore the parts to their initial position, and means actuated by said first means during the reverse operation to eject the other rivet element from the anvil.

6. A machine for setting rivets of the type wherein a pin is pulled partially through a tubular member having a preformed headat one end to form a second head at the other end, including, means to engage the pin, an anvil adapted to engage the preformed head and swage said head to the pin by telescoping over the head, means to apply a pulling force to said pin engaging means and a reactive force to said anvil to efiect the rivet setting and swaging operations, means to reverse thedirection of the applied forces on said pin engaging means and anvil, and means carried by said pin engaging means and operable when the direction of application of force is reversed for ejecting the preformed head from the anvil.

7. In a rivet setting machine, a rivet head swaging anvil, a pin gripping device, means for moving said anvil and gripping device relatively in opposite directions to drive the anvil over the rivet head and swage the head to the pin, and means operated by said pin gripping device for ejecting the rivet head from the anvil when the relative movement between the anvil and gripping device is reversed.

8. In a rivet setting machine, a casing, a rivet head swaging anvil having an opening therein and fixed to said casing, a rivet pin gripping device slidably mounted in said casing rearwardly of said anvil, an ejecting member operatively associated with said pin gripping device and extending into said opening, means for moving said pin gripping means rearwardly with respect to said anvil to drive the anvil over said rivet head, said means being reversible to move said gripping device toward said anvil and said pin gripping device and ejecting member having surfaces adapted to abut when the device is reversely moved whereby the ejecting member will advance into said anvil opening and eject the rivet head therefrom.

9. In a rivet setting machine, a casing, a rivet head swaging anvil having an opening therein fixed to said casing, a rivet pin gripping device slidably mounted in said casing rearwardly of said anvil, an ejecting member slidably carried by said casing between said anvil and gripping device and having an operative portion extending into said anvil opening, means for moving said pin gripping device rearwardiy with respect to said anvil to drive the anvil over the rivet head, said means being reversible to move said gripping device towards said anvil and said pin gripping device and ejecting member having surfaces adapted to abut when the device is reversely moved to engage said ejecting member and advance the operative portion thereof into said anvil opening to eject the rivet head from the anvil.

10. In a rivet setting machine, a casing, an annular anvil fixed with respect to said casing and adapted to swage a rivet head, an ejecting member slidably mounted in said casing, a rivet pin engaging member slidably mounted in said casing and adapted to move in one direction independently of said ejecting member to drive the anvil over a rivet head, said ejecting and pin said anvil in said opening, means to limit the relative movement between said member and anvil whereby said member at one limit of its motion provides an abutment for limiting the movement of a rivet head into said anvil, and movement of the memberto its opposite limit ejects the rivet head, and means to' move the member from said first limit to said other limit.

12. In a rivet setting machine an anvil having an opening therein, a rivet ejecting member mounted within said opening for sliding movement with respect to said anvil, and interengaging means on said anvil and ejecting member for limiting the relative movement of said anvil and member in both directions.

13. In a rivet setting machine, a rivet head swaging anvil having a rivet head engaging and swaging surface and an opening therein, means associated with said anvil apart from said swaging surface for engaging the rivet head and limiting the swaging movement of the anvil with respect to the head, and means movably mounted in said machine for ejecting the swaged rivet head from the anvil opening.

14. A machine for setting rivets of the type wherein a pin is pulled partially through a tubular member having a, preformed head at one end to form a second head at the other end, including means to engage the pin, an anvil adapted to engage the preformed head and swage said head to the pin by telescoping over the head, means to apply a pulling force to said pin engaging means and a reactive force to said anvil to effect the rivet setting and swaging operations, means to reverse the direction of the applied forces on said pin engaging means and anvil, and means carried by the anvil and actuated by said pin engaging means and operable when the direction of application of force is reversed for ejecting the preformed head from the anvii.

' LOUIS C. HUCK. 

